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Age
In 2007, a star in the Galactic halo, HE 1523-0901, was estimated to be about 13.2 billion years old. Measurements of thin disk stars yield an estimate that the thin disk formed between 8.8 ± 1.7 billion years ago. These measurements suggest there was a hiatus of almost 5 billion years between the formation of the Galactic halo and the thin disk.

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